/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.cxf.jaxrs.sse;

import java.io.IOException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.ws.rs.sse.OutboundSseEvent;
import javax.ws.rs.sse.SseBroadcaster;
import javax.ws.rs.sse.SseEventOutput;

public class SseBroadcasterImpl implements SseBroadcaster {
    private final Set<SseEventOutput> outputs = new CopyOnWriteArraySet<>();
    private final Set<Listener> listeners = new CopyOnWriteArraySet<>();
            
    @Override
    public boolean register(Listener listener) {
        return listeners.add(listener);
    }

    @Override
    public boolean register(SseEventOutput output) {
        return outputs.add(output);
    }

    @Override
    public void broadcast(OutboundSseEvent event) {
        for (final SseEventOutput output: outputs) {
            try {
                output.write(event);
            } catch (final IOException ex) {
                listeners.forEach(listener -> listener.onException(output, ex));
            }
        }
    }

    @Override
    public void close() {
        for (final SseEventOutput output: outputs) {
            try {
                output.close();
                listeners.forEach(listener -> listener.onClose(output));
            } catch (final IOException ex) {
                listeners.forEach(listener -> listener.onException(output, ex));
            }
        }
    }
}
